夏热冬冷地区区域供能系统供冷季的运行策略研究

发布时间：2018-03-24 11:04

  本文选题：分布式能源　切入点：区域供能系统　出处：《湖南大学》2015年硕士论文

【摘要】：随着传统化石能源的逐渐消耗、能源供应的日益紧张和人们对能源需求及对空气污染担忧的增长,提高能源利用率、合理利用资源和节能减排已成为全球关注的问题,在此种背景下,因其在节能环保和运行等方面的优势,区域供冷和分布式能源系统等高效节能技术受到了广泛的关注和应用。分布式能源系统可实现区域供冷,将分布式能源系统与区域供冷结合可降低区域供冷的运行成本,使得区域供冷系统在节能领域中占重要的地位。区域供冷和分布式能源系统的节能、经济和环保优势仅在其有合理的配置运行下才能充分发挥。因而对其进行优化研究很有必要。本文通过建立一个以一次能源节约率最大和成本节约率最大为优化目标的优化模型,并利用e QUEST软件模拟计算夏热冬冷地区某典型公共建筑小区的全年逐时冷热电负荷,对由燃气分布式能源系统(燃气冷热电联产系统)和土壤源热泵组成的区域供能系统供冷季即冷电工况下的运行进行了优化研究。其运行策略为先进行成本节约最优再进行节能最优。并从经济的角度以年折算费用最小为优化目标对此典型小区的区域供冷管网供回水温差进行了优化,得出最佳的温差为6.3℃。此外,还讨论了电价和天然气价格等主要因素的变化对此区域供能系统运行的影响,当电价较低,天然气价格较高时燃气冷热电联产系统不运行,区域的负荷需求由土壤源热泵和电网满足;当电价较高,天然气价格较低时燃气冷热电联产系统运行,区域的负荷需求先由燃气冷热电联产系统满足,若不足则由土壤源热泵和电网来提供。燃气分布式能源与土壤源热泵耦合系统是一次能源(天然气)与可再生能源(土壤)的结合,其有效运作可弥补各子系统单独运行时的不足,并提高系统的节能性和经济性等。对分布式能源和地源热泵耦合系统进行优化配置和运行,会使得系统具有更经济、环保、节能的特性,也可为分布式能源系统和其他可再生能源系统的结合提供参考。
[Abstract]:With the gradual consumption of traditional fossil energy, the increasing shortage of energy supply and the increase of people's concern about energy demand and air pollution, increasing energy efficiency, rational utilization of resources and energy saving and emission reduction have become the global concern. In this context, because of its advantages in energy-saving, environmental protection and operation, regional cooling and distributed energy systems and other high-efficiency energy-saving technologies have been widely concerned and applied. Distributed energy systems can realize regional cooling. The combination of distributed energy system and regional cooling can reduce the running cost of regional cooling, and make the regional cooling system play an important role in the field of energy saving. The advantages of economy and environmental protection can only be brought into full play when they have reasonable configuration and operation. Therefore, it is necessary to study on the optimization of the advantages. In this paper, we set up a method to optimize primary energy saving rate and cost saving rate. The optimization model of the target, The hourly cooling and heating power load of a typical public building district in hot summer and cold winter area is calculated by using e QUEST software. The operation of regional energy supply system which is composed of gas distributed energy system (gas cooling, heat and power cogeneration system) and ground source heat pump (GSHP) is studied in this paper. The operation strategy is cost saving first. From the economic point of view, with the minimum annual conversion cost as the optimization goal, the temperature difference between the supply and return water of the district cooling pipe network in this typical district is optimized. The optimum temperature difference is 6.3 鈩，

本文编号：1658013